Sometimes all it takes to spark and adventure idea is a couple of cool pictures. While looking at pictures of caves and caverns, I came across the first picture to the right and couldn't help but think that it made a great spooky, but disturbingly unassuming entrance to something greater and more wicked below.
Looking further through the pictures I found the second image and got to thinking, "what if that not just a trick of lighting, but the natural color of that cavern?" With it's hanging stalactites, the red stone would look like dripping blood, a fitting place for a blood cult, a vampire, or even a pack of ghouls.
These are not all my images. I am using various images from around the web, mostly from public sources or private sources used with permission. I have tried to include only images under public domain, creative commons, or fair use. If I have inadvertently violated any copyrights, please inform me and I will remove your image(s) if it an infringement.